A manual technique of Radiography, Where Gamma rays or X-rays are bombarded on the specified area for a certain period of time, Producing an image to detect any internal cavity on the specimen”, Known as Conventional radiography.
Conventional Radiography is the most widely and well known NDT method over Digital Radiography.
This basically uses High Energy photons to Detect Various flaws in the test specimen, which you will be know further in detail down below.
Now, Let’s dwell step by step information about conventional radiography, Here you will get complete information on Conventional Radiography.
You can download the full article as a pdf at the conclusion of the post as a gift from me to you.
Lets, First get some knowledge of what is Radiography?
What is Radiography?
It is a technique for detecting any internal cavity of any metals or alloy using ionizing radiation like Gamma rays or X-rays without any wear and tear. Where we use Gamma or X-rays camera and films to performs any Radiography testing.
I hope, you gained a main overview of Radiography, So now let’s know about the types of Radiography.
Type of Radiography-
There are mainly two types of Radiography
1. Conventional Radiography(CR)
2. Digital Radiography(DR)
Here, I Will discuss Conventional radiography, keeping in mind your purpose of landing on this page.
As I discussed above, Gamma rays or X-rays is used to detect the discontinuity in the object on Surface level or Sub-Surface level through the manual process.
Conventional Radiography Process–
In this type of radiography, you need a gamma or x-rays camera, a film cassette, a specific object, and some numbers to identify areas for marking after completing the procedure of Radiography testing.
Advantages of Conventional Radiography-
- Suitable for complex structure materials
- Minimum space area required
- Higher thickness materials inspection
- The minimum size of flaws can be detected
- Variety of materials inspection
Disadvantages of Conventional Radiography–
2. In-complete information- Due to the limitation of radiography, we can not get complete information, Because you can take a single shot per taking, resulting in taking multiple shots of a single object to cover the whole area, Due to that, some parts of the object area may left.
3. Processing error- Processor error is one of the biggest limitations in conventional radiography. Because, When a film is processed manually, there are maximum chances of getting scratch on film, or film contrast might be high or low, resulting in Re-take. A single mistake, Your all works have vanished.
4. Radiation exposure- While taking Radiography shots, the Object is bombarded by Gamma or X-rays and if a Radiography person is there, he hits by those radiations with the same intensity. The more he is getting involved in multiple shots, He continuously exposed to radiation, and these continue hits of radiation attacks on their cell, causing Radiation health hazardous for him in long run.
5. Extreme physical activities- A radiography person has to run continuously, To minimize radiation exposure during the shots.
6. Wastage of resources- While performing the test, There are several mistakes that might be done like processing errors, and this cause various resource wastage including manpower loss, Film loss, Time-lose, etc.
For more detailed information, You can watch out this video Given Below-
If You are here for Conventional Radiography, then that’s it from the side, or if you want to know comparison between Digital and conventional Radiography?
Then continue with me…..
➤Digital Radiography Vs Conventional Radiography
- Fixed Contrast- The contrast of the radiograph is fixed in this type of radiography, You can not change film density If needed.
- Limited View- It gives only a 2D view of a 3D object, you can not zoom in or zoom out or Flip the image If needed.
- Duplicacy– Conventional Radiography is the best technique to create a duplicate image. If you want to show the clean image without any cavity to the client, You just need to take a shot from the Passed area bolllaa, You are good to go.
- Mobile-friendly– Set up of convention type of Radiography can be mobilized, if an object can not move.
- Variable Contrast- The contrast of the radiograph can vary, You can adjust the contrast of the radiograph according to your need.
- Unlimited View- It gives a very detailed and crisp image of the object and you can also zoom in and zoom or flip according to your needs.
- Time-Saver- Digital radiography saves an enormous amount of time Because it combines all needed equipment in a single place and can operate at ease with approx single manpower.
These are the basic side-by-side comparison of both types of Radiography, Both are suitable at their place Because of mobility in some cases.
For Detailed comparison knowledge regarding the same, You can watch this video clip given Below…
- Conventional radiography
- Digital radiography
Ans. Here are some limitations of CR-
- Lack of resolution
- Physical activities
- Resources wastage
Abhishek Tiwary is a blogger by passion and a Quality Engineer by profession. He completed his B.Tech degree in the year 2017. Now working in a reputed firm. He loves to share his knowledge with others.